Course you can use varnish .You will need more than two coats to get a decent finish ,more like six plus . Epoxy is harder wearing .Used as a flow coat it can be done in one hit if done correctly . Good varnish ,two pack polyurathane . floor varnish or yacht varnish .Epifanes .

6 coats are a Minimum for poly, 1 spit coat (half thinner, half poly) then 5 full coats. UV resistance is not needed you dont leave your board out 24/7, so skipp to spar and marine poly, Use the fastest drying poly you can get Minwax makes a good fastdry poly, recoat in 2 hours. It takes 2 days to finish with fast dry poly or epoxy.
You could get by with 2 coats of poly, as long as you really wetted the wood out with the spit coat, but the board wont have a finish and just be waterproof.

I only sand after the SPIT coat, after that just lay it on every 4 hours. If using Epoxy and you want a Sacraficial or UV protection coat of poly. You MUST WASH THE EPOXY WITH SOAP AND WATER TWICE, and then sand lightly or the Poly will NEVER dry/cure.
If you want colored board, add a little oil paint or have the hardware store add pigment to the poly, they mite complain a little but those bright base pigments are really bright.

No ,I do one hit flow coat with clear polyester film .When cured I take off the polyester film and its finished ,no sanding nothing .Ido my graphics at the same time .Inever sand etc once its done .It comes up like glass . You cannot get the same finish even if you tried spraying .

No need for epoxy in a ply board. The wood will soak up too much resin and the board will become very heavy (I learned this the hard way ). A couple coats of Polyurethane Varnish or a Polyurathane boat paint will be much lighter and give you sufficient protection from water.

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